Question

what are some examples of molecules that play a role in a feedback loop?

Answer 1

Ans : Molecules that play an imp role in feedback loop :

Feedback loop : Feedback is defined as the information gained about a reaction to a product, which will allow the modification of the product. Feedback loops are therefore the process whereby a change to the system results in an alarm which will trigger a certain result. This result will either increase the change to the system or reduce it to bring the system back to normal.

These molecules range from nutrients to toxic compounds. A commonly occurring motif in the networks sensing such signal molecules is a negative feedback loop. In this motif an enzyme used to metabolize the signal molecule is controlled by a regulator whose action, in turn, is regulated by the same signal molecule.

Molecules ranges from toxic sub - nutrients

Examples :

Positive feedback:

Ripening of fruits : molecule- ethylene

Child birth : molecule- oxytocin

Negative feedback:  

Temp regulation : molecule- receptors in b.vessels

B.p regulation : molecule - chemical signals